Why "might as well be?" Dollars can't accurately determine something's real value and I'm baffled that people continually assume this. A teacher is more valuab

Why "might as well be?" Dollars can't accurately determine something's real value and I'm baffled that people continually assume this. A teacher is more valuable than an investment banker and yet the investment banker is paid more. Maybe I can make a spreadsheet of all the instances of such things and it would reach tens of thousands of rows. It seems to me plain as day so I don't get it. Sometimes the dollar value is accurate, often not. The frequency that it's incorrect makes me wonder at the authority we grant dollar valuations.